AfroWithaChanceofMeatballs

I want to laugh at some jokes. I mainly want to laugh at some silly/corny jokes. So tell me citizens of Kinja, what's the silliest and/or corniest joke you have ever heard? What's the best? Bonus points for references for nerdiness.

Banishment for jokes that are offensive (if there is any doubt in your mind a joke might be offensive....then it's offensive).